Year	Percent
1960	22.91484
1961	8.05836
1962	4.90204
1963	8.40724
1964	10.84528
1976	22.08264
1977	26.1458
1978	33.72298
1979	57.88206
1980	70.01458
1981	39.66199
1982	49.92142
1983	72.37221
1984	44.39933
1985	130.87534
1986	81.42334
1987	60.85353
1988	70.37168
1989	43.07922
1990	24.15873
1991	18.67374
1992	61.65635
1993	33.18146
1994	29.95047
1995	30.99256
1996	20.14219
1997	13.25337
1998	18.35823
1999	22.29475
2000	7.3851
2001	5.95836
2002	7.7957
2003	13.15679
2004	15.8081
2005	24.47501
2006	19.7716
2007	16.74451
2008	19.15205
2009	18.06891
2010	13.39338
2011	9.55347
2012	10.98387
2013	13.27647
2014	7.56989
2015	8.90863
2016	8.44576
2017	6.17378
2018	29.95602
2019	33.19178
2020	150.10551
2021	317.38227